1. Artificial Intelligence Fuzzy Logic Systems
Zeeshan Mohammad Ali
Fa13-Bs-0011

2. What is Fuzzy Logic?
Fuzzy Logic (FL) is a method of reasoning that resembles human reasoning. The approach of FL imitates the way of decision making in humans that involves all intermediate possibilities between digital values YES and NO.

3. The inventor of fuzzy logic, Lotfi Zadeh, observed that unlike computers, the human decision making includes a range of possibilities between YES and NO, such as −
- CERTAINLY YES
- POSSIBLY YES
- CANNOT SAY
- POSSIBLY NO
- CERTAINLY NO
The fuzzy logic works on the levels of possibilities of input to achieve the definite output.

4. Fuzzy logic Truth value
Fuzzy logic Truth value ranges between 0 (completely false) and 1 ( completely true).

5. Implementation
It can be implemented in systems with various sizes and capabilities ranging from small micro-controllers to large, networked, workstation-based control systems.
It can be implemented in hardware, software, or a combination of both.

6. Why Fuzzy Logic?
Fuzzy logic is useful for commercial and practical purposes.
It can control machines and consumer products.
It may not give accurate reasoning, but acceptable reasoning.
Fuzzy logic helps to deal with the uncertainty in engineering.

7. Example of a Fuzzy Logic
Let us consider an air conditioning system with 5-level fuzzy logic system. This system adjusts the temperature of air conditioner by comparing the room temperature and the target temperature value.

8. Example of a Fuzzy Logic

9. Example of a Fuzzy Logic
RoomTemp. /Target
Very_Cold
Cold
Warm
Hot
Very_Hot
No_Change
Heat
Cool

10. Example IF-THEN-ELSE structures.
Condition
Action 1
IF temperature=(Cold OR Very_Cold) AND target=Warm THEN
Heat 2
IF temperature=(Hot OR Very_Hot) AND target=Warm THEN
Cool 3
IF (temperature=Warm) AND (target=Warm) THEN
No_Change

11. Application Areas of Fuzzy Logic
Automotive Systems
-Automatic Gearboxes
-Four-Wheel Steering
-Vehicle environment control
Consumer Electronic Goods
-Hi-Fi Systems
-Photocopiers
-Still and Video Cameras
-Television
Domestic Goods
-Microwave Ovens
-Refrigerators
-Toasters
-Vacuum Cleaners
-Washing Machines
Environment Control
-Air Conditioners
-Dryers
-Heaters
-Humidifiers